Samuel gbossioed



' UNITED STATE PATENT OFFICE.

SAMUEL GROSSIORD, or LEs MoUssIEEEs, FRANCE.

ART OF PREPARING PRECIOUS AND lMlTATlON PRECIOUS STONES.

SPECIFICATION forming part of Letters Patent No. 290,040, dated December 11, 1883.

Application filed August 9, 1883. (1Y0 specimens.) Patented in France October 25, 1882, No.151,732.

T at whom it may concern:

Be it known that I, SAMUEL GROSSIORD, a citizen of the a French Republic, residing at Les Moussieres, in the French Republic, have invented certain new and useful Improvements in Art of Preparing Precious and Imitation Precious Stones, (for which I have obtained Letters Patent in France, No. 151,732, under date of October 25,1882;) and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in the art of preparing precious stones for cutting and mounting, whereby a greater brilliancy is imparted to the stones, whatever may be the nature or color of the latter.

The invention further relates to the preparation of artificial precious stones, technically termed diamondines, or ruby, sapphire, &c., diamondines, according to their color.

It is well known that certain precious stones-such as rubies, sapphires, &c.do not acquire greater brilliancy by silvering (i. e., mating with silver) a portion of their sur- Iace. Thisis also the case with most of the transparent enamels used in the manufacture of artificial precious stones and-rock-crystal. Although colorless, the brilliancy of the latter is but slightly, if at all, increased by the usual process of silver-coating. I have found, how ever, that the brilliancy of such precious stones or enamels or rock-crystal is materially increased by interposing colorless strass between these substances and the reflecting medium. Garnet is the only precious stone that can be united with another by means of fusion, and this, as well as all the enamel usually employed in the manufacture of artificial precious stones, may therefore be cemented to the strass by fusion. In all other cases cold cementing is to be resorted to.

In the preparation of the stones-artificial or otherwise-more or less strass may be employed, and, if desired, the enamel for diamondines may be interposed between two sections or layers of strass. The cementing may bev effected prior or subsequent to the cutting 5c of the stone or imitation stone and the strass.

Very good effects are produced in imitation precious stones by cementing the stone between two layers of strass. By silvering the backing of strass, not only is the brilliancy of the stone greatly enhanced, but the strass is 5 mondines, and I do not desire to claim, broad-' 65 ly, in this application the use of strass in the manufacture of imitation precious stones; but

- WVhat I do claim is 1. The method of increasing the brilliancy of precious as well as imitation precious 7c stones by means of a light reflecting substance, which consists in interposing colorless strass between the reflector and the stone, as described.

2. The method of preparing precious stones- 7 5 such as garnets, rubies, sapphires, &c.which consists in cementing them to colorless strass, as described, for the purpose specified.

3. The method of preparing precious and imitation precious stones and increasing their 8c brilliancy, which consists in cementing the precious or imitation precious stone to colorless strass previous or subsequent to cutting the same, and coating the under side of the strass with a light-reflecting substance, as described. 8

4. A precious stone having a backing of colorless strass, as described.

5. A precious or imitation precious stone having a backing of strass coated with a refleeting medium, substantiallyas and for the 9c purpose specified.

In testimony that I claim the foregoing I have hereunto set my hand this 21st day of July, 1883.

SAMUEL GROSSIORD.

Witnesses:

LOUIS COUSSAINT, FREDERIC MATRAY. 

